﻿using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using Utils.SoftReferences;

namespace Tests
{
    /// <summary>
    /// Summary description for UnitTest1
    /// </summary>
    [TestClass]
    public class SoftRefTests
    {
        public SoftRefTests()
        {
            //
            // TODO: Add constructor logic here
            //
        }

        private TestContext testContextInstance;

        /// <summary>
        ///Gets or sets the test context which provides
        ///information about and functionality for the current test run.
        ///</summary>
        public TestContext TestContext
        {
            get
            {
                return testContextInstance;
            }
            set
            {
                testContextInstance = value;
            }
        }

        #region Additional test attributes
        //
        // You can use the following additional attributes as you write your tests:
        //
        // Use ClassInitialize to run code before running the first test in the class
        // [ClassInitialize()]
        // public static void MyClassInitialize(TestContext testContext) { }
        //
        // Use ClassCleanup to run code after all tests in a class have run
        // [ClassCleanup()]
        // public static void MyClassCleanup() { }
        //
        // Use TestInitialize to run code before running each test 
        // [TestInitialize()]
        // public void MyTestInitialize() { }
        //
        // Use TestCleanup to run code after each test has run
        // [TestCleanup()]
        // public void MyTestCleanup() { }
        //
        #endregion

        [TestMethod]
        public void EmptySetCanBeRefreshed()
        {
            new SoftRefSet().Refresh(new ISoftRefTarget[0]);
        }

        class LivingThing : ISoftRefTarget
        {
            public string Species { get; set; }
            public int Id
            {
                get; set;
            }
        }

        [TestMethod]
        public void SoulReferenceCanBeDereferenced()
        {
            var s = new SoftRefSet();

            SoftRef<LivingThing> sr = s.Register(new LivingThing() { Id = 42, Species = "Worm" });

            Assert.AreEqual("Worm", sr.Target.Species);
        }

        [TestMethod]
        public void RefreshSingleObject()
        {
            var s = new SoftRefSet();

            SoftRef<LivingThing> sr = s.Register(new LivingThing() { Id = 42, Species = "Worm" });

            Assert.AreEqual("Worm", sr.Target.Species);

            s.Refresh(new ISoftRefTarget[] { new LivingThing() { Id = 42, Species = "Wombat" } });

            Assert.AreEqual("Wombat", sr.Target.Species);
        }

        [TestMethod]
        [ExpectedException(typeof(ApplicationException), "SoulReference #42 was not supplied in the fresh list of referees.")]
        public void RefreshSingleObjectFailsIfReplacementIsNotSupplied()
        {
            var s = new SoftRefSet();

            SoftRef<LivingThing> sr = s.Register(new LivingThing() { Id = 42, Species = "Worm" });

            Assert.AreEqual("Worm", sr.Target.Species);

            s.Refresh(new ISoftRefTarget[] { new LivingThing() { Id = 1, Species = "Amoeba" } });
        }
    }
}
